[U-Boot-Custodians] SPL / TPL

[Kever Yang]

On 2019/10/8 下午11:31, Bin Meng wrote:
> Hi,
>
> Simon is on vacation, hence I hoped to get the clarification from
> other maintainers.
>
> As I see in U-Boot currently only NXP PowerPC uses TPL in the NAND
> configurations, and some ARM boards use TPL.
>
> It looks in x86 we are using TPL in a different boot flow and this
> confused me a lot in the past.
> In x86 we expect TPL to load SPL then U-Boot proper. (TPL => SPL =>
> U-Boot proper)
>
> However in README.TPL, it says TPL is the 3rd program loader, to be
> loaded by SPL. So if my read is correct, the expected boot flow is SPL
> => TPL => U-Boot proper.
>
> I believe only one boot flow is the correct way. So which one is correct?

There was a discussion about this when we want to add TPL for Rockchip 
platform, Simon, Philipp
and other people share there opinion , but I can't find it now, and 
people decide to follow:
(TPL => SPL => U-Boot proper)
Other than the README.TPL, I believe people also mention below presentation:
https://www.denx.de/wiki/pub/U-Boot/MiniSummitELCE2013/tpl-presentation.pdf

Thanks,
- Kever


> Regards,
> Bin
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